Hi Don, welcome to the Shack! Feel free to ask as many questions as you like.
Painted screens get mixed reviews -- some people love them (mainly due to the cost savings) whereas others say you would be crazy not to get a proper projector screen. One of the key things to watch is "gain"... if your gain is too high (especially in a dedicated HT room) the image will be extremely bright. A low gain can produce some very deep blacks, but you have to make sure your room and projector are up to the task.
The Denon components sound sweet (I'm a Denon fan too) but the Bose speakers may let you down over time. Simply plan your walls as if you *will* upgrade at some point -- ie: conduit, heavy speaker cabling, sturdy wallplates. Lots of info in these forums about all that stuff.
(Although one of your first purchases could be a keyboard with a working "shift" key...
)